. The microscope : an introduction to microscopic methods and to histology. Microscopes. CH. VII] CLASS DEMONSTRATIONS microscope is limited. With it one can show organs both adult and embryonic, and the general morphology. For the accurate demon- stration of cells and cell structure the microscope itself must be used. As a general statement concerning the use of the projection micro- scope for demonstration purposes, it may be said that it is entirely satisfactory for objects and details which show under the microscope with objectives up to 16 mm. equivalent focus. For objects and details req
. The microscope : an introduction to microscopic methods and to histology. Microscopes. CH. VII] CLASS DEMONSTRATIONS microscope is limited. With it one can show organs both adult and embryonic, and the general morphology. For the accurate demon- stration of cells and cell structure the microscope itself must be used. As a general statement concerning the use of the projection micro- scope for demonstration purposes, it may be said that it is entirely satisfactory for objects and details which show under the microscope with objectives up to 16 mm. equivalent focus. For objects and details requiring objectives higher than 16 mm. focus in ordinary microscopic observations, the projection microscope is unsatisfactory with large classes. 5_ 10. Fig. 159. Slide of several sections with a black mask. The mask is per- forated over the sections to be demonstrated with the microscope or Hie pro- jection microscope. It is put on the back of the slide and not on the cover-. glass. Unless one has a mask something like this the light is so dazzling that it is almost impossible to find the proper sections. It is easily removed by plac- ing the slide on wet Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gage, Simon Henry, 1851-1944. Ithaca, N. Y. : Comstock Publishing Company
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